Effects of benzyladenine and α-naphthaleneacetic acid on the early growth phase of Ananas comosus (L.) Merr.

Abstract

In this study, benzyladenine (BA) and α-naphthaleneacetic acid (NAA) are used to study the growth of pineapple fruit (Ananas comosus (L.) Merr.) in the early growth phase. Pineapple fruits are sprayed with BA or NAA at different concentrations (1, 5, 10, 20, 40 and 60 mg.L^-1) at both 0 and 3 days after flowering (DAF, 50 % dried flowers). Fruits are sampled every 15 days from 0 to 75 days to survey to weight, size and qualities of pineaple fruit. Besides, fruits (which are sprayed with BA or NAA at concentration 20 mg.L^-1) are sampled at 15 days for the cell size observation. The results showed that the treatments with three highest concentration of BA or NAA (20, 40 và 60 mg.L^-1) significantly increased fruit weights and fruit sizes. Exogenous BA or NAA at the concentration 20 mg.L^-1 increased the fruit weights by increasing the number of flesh cells without negative effects on fruit qualities.